WebRTC Inbound No Audio

I am struggling with getting inbound audio to work using WebRTC. Outbound (WebRTC → FreePBX) works without any issue. Inbound (FreePBX → WebRTC) the webrtc client transmits audio out (mic) but cannot hear inbound audio.

I have tried using a standard SIP phone and it works no issue both directions so this is specific to webrtc. Any ideas?